Model A model B oil pump questions

[31Abone]

Are both A & B pump bodies the same ? is the shaft the only difference ? I think they were running an A pump in my B motor but not sure... my motor lost # 4 rod.. how to identify pumps to be sure its a B oil pump ..tnx much ..sc

[Jim Brierley]

A & B pumps are almost identical, either one would supply enough oil to the engine. Be sure the can is over the pump and that gasket is good, otherwise the pump can draw air, thus less oil goes into the engine.

[ursus]

Since the rods in both A and B engines are lubricated by the same dipper and splash system, the choice of oil pump should make no difference. Main bearings are a different matter as the B-engine has pressurized mains and the Ford service bulletin from November 1932 contained explicit warnings against using an A pump in the B engine, then referred to as "the improved 4-cylinder engine".

[redmodelt]

The pump bodies are all most the same. The A pump has round holes and the B more like slits at the top in the recessed area. Of course the other difference is the B has reduced shank on the shaft for higher volume which could be what is needed for the B engine.
(I could have the slit and hole reversed)

[Kurt in NJ]

Look closely to see if there is a pinhole in the dipper tray that drains it at #4

[Bob Bidonde]

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I recall that the rectangular oil output opening in the Model "B" pump has a larger area than the round hole in the Model "A" pump. So the output volume of the Model "B" pimp is larger.

[31Abone]

Good info keep it up ..tnx much

[Jim Brierley]

Kurt brings up a good point about holes in the dipper tray. If any water has gotten into the oil, the tray can rust. Remove the tray, clean it, and hold it up to sunlight to inspect for any pin-holes. Holes can make the rods run dry.

[johnneilson]

31,
can you elaborate on the motor oiling setup?
dipper tray could be the problem, but if crank drilled and block passages not enlarged or partially blocked can starve rod too.

[ursus]

Originally Posted by Bob Bidonde

I recall that the rectangular oil output opening in the Model "B" pump has a larger area than the round hole in the Model "A" pump. So the output volume of the Model "B" pimp is larger.

True. Also, some earlier A pumps have only one outlet hole facing the single tube leading to the oil galley. If used in a B-engine the rear main will be starved of oil.

[Benson]

Urus,

Nothing against what you posted ... Just blowin' off steam.


About 15 years ago I posted this info and more, on old F B site and was told in no uncertain terms that I did not know what I was talking about and that the expert knew more than I did! I guess Bill Kenz was wrong also!


I changed my user name and erased the postings and have not mentioned it again.

Originally Posted by ursus

Since the rods in both A and B engines are lubricated by the same dipper and splash system, the choice of oil pump should make no difference. Main bearings are a different matter as the B-engine has pressurized mains and the Ford service bulletin from November 1932 contained explicit warnings against using an A pump in the B engine, then referred to as "the improved 4-cylinder engine".

[ursus]

Originally Posted by Benson

Urus,

Nothing against what you posted ... Just blowin' off steam.


About 15 years ago I posted this info and more, on old F B site and was told in no uncertain terms that I did not know what I was talking about and that the expert knew more than I did! I guess Bill Kenz was wrong also!


I changed my user name and erased the postings and have not mentioned it again.

The experts among us provide useful information although sometimes what they claim to "know" just ain't so. I've been corrected on here a few times myself, usually for the better but occasionally the response was wrong or only created confusion. We are fortunate to have the Fordbarn for the wealth of information and experience it provides. The "your mileage may vary" disclaimer is a good one to keep in mind.